CN211781878U - Air conditioner fan pipeline silencer - Google Patents
Air conditioner fan pipeline silencer Download PDFInfo
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- CN211781878U CN211781878U CN201922246657.7U CN201922246657U CN211781878U CN 211781878 U CN211781878 U CN 211781878U CN 201922246657 U CN201922246657 U CN 201922246657U CN 211781878 U CN211781878 U CN 211781878U
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Abstract
The utility model discloses an air conditioner fan pipeline silencer, including shell, interior intubate, division board and sound absorbent, interior intubate is connected inside the shell, and between intubate and the shell, air gap has between interior intubate and the division board in the division board is located, fills sound absorbent between shell and the division board, is equipped with a plurality of perforation on interior intubate and the division board respectively. When the airflow flows through the air gap at the inner insertion tube, the airflow contracts and expands, and a resonant cavity is formed to change the acoustic reflection action at the acoustic performance mutation position in the pipeline, so that acoustic impedance mismatch is generated, acoustic waves with certain frequencies are reflected and interfered at the acoustic impedance mutation position, the noise elimination and reduction effect is improved, and the airflow flow is not blocked.
Description
Technical Field
The utility model relates to a silencer technical field, in particular to air conditioner fan pipeline silencer.
Background
The large air conditioner is widely applied to places such as large shopping malls, office buildings, hospitals, schools, sports and entertainment and the like, but the noise problem brings considerable influence on the physiology and the psychology of people, and complaints of the noise problem become main factors of all complaints of the air conditioner. The air conditioner noise comprises the following components: (1) aerodynamic noise; (2) mechanical noise; (3) electromagnetic noise. The aerodynamic noise of the fan pipeline is a main source of noise of a large air conditioner, is a main factor for polluting the environment, and is one of main objects for controlling noise pollution in the industrial departments of China in recent years.
The silencer is generally applied to aerodynamic noise control and is usually installed on an inlet and an outlet of various compressors or airflow pipelines, and the noise reduction of the air conditioner fan pipeline is mainly realized by installing a tubular silencer on a pipe coil of a fan, so that the silencer not only can allow airflow to smoothly pass, but also can effectively prevent or weaken sound energy from spreading outwards to achieve the purpose of noise reduction.
At present, the structural improvement applied to air conditioner fan pipeline silencers on the market usually adopts different materials or compounds different silencers in the air flow direction, and the most commonly used is a single-section expanding silencer. In order to avoid the defect, the chinese patent CN 204851379U discloses an interpolation silencer with a perforated pipe expansion pipe, which proposes that the air inlet pipe of the silencer is interpolated, and simultaneously holes are formed on the inner insertion pipe.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides an air conditioner fan pipeline silencer, and existing effect noise reduction does not hinder the flow of wind speed simultaneously.
The technical scheme of the utility model is that: the utility model provides an air conditioner fan pipeline silencer, includes shell, interior intubate, division board and sound absorbent, interior intubate is connected in the shell, and the division board is located between interior intubate and the shell, has air gap between interior intubate and the division board, fills the sound absorbent between shell and the division board, is equipped with a plurality of perforation respectively on interior intubate and the division board. When the airflow flows through the air gap at the inner insertion tube, the airflow contracts and expands, and a resonant cavity is formed to change the acoustic reflection action at the acoustic performance mutation position in the pipeline, so that acoustic impedance mismatch is generated, acoustic waves with certain frequencies are reflected and interfered at the acoustic impedance mutation position, the noise elimination and reduction effect is improved, and the airflow flow is not blocked.
Further, the air gap is 18-30mm, and the air gap can increase the transmission loss of the silencer and change the acoustic performance of the silencer.
Further, the distance between the outer shell and the inner inserting tube is 45-55 mm.
Further, air conditioner fan pipeline silencer still includes the shunt tubes, the shunt tubes is located interior intubate, and the shunt tubes is connected along the axial and interior wall of intubate, separates the intraductal space of intubate, is equipped with the chamber of eliminating the noise in the shunt tubes, is equipped with a plurality of perforation and the chamber intercommunication of eliminating the noise on the shunt tubes, packs sound absorbing material in the chamber of eliminating the noise. When the airflow passes through the shunt tubes, the sound absorption material filled in the shunt tubes absorbs sound,
furthermore, both axial ends of the shunt tubes are provided with closed guide inclined planes, and the guide inclined planes reduce the resistance of airflow entering the silencer and can reduce noise.
Furthermore, the perforation rate of the inner inserting tube is 15-23%, the perforation rate of the shunt tube is 15-23%, and the perforation rate of the separation plate is 15-23%.
Furthermore, the diameter of the through hole on the inner inserting pipe is 4-7mm, the diameter of the through hole on the shunt pipe is 4-7mm, and the diameter of the through hole on the partition plate is 4-7 mm.
Furthermore, the sound absorption material is glass fiber cotton, the density of the sound absorption material is 95-110g/L, the porosity is 0.9-0.98, and the flow resistance is 10000 Pa.s/m2. The filling of the glass fiber cotton can effectively improve the acoustic performance of the silencer, and particularly, the transmission loss of the silencer is obviously improved in the range of 900Hz to 2000 Hz.
Furthermore, the outer shell comprises a silencing section and pipe orifices positioned at two ends of the silencing section, the cross section area of the silencing section is larger than that of the pipe orifices, the inner insertion pipe is arranged at the silencing section, and the cross section area of the inner insertion pipe is the same as that of the pipe orifices. The inner insertion pipe is arranged in the outer shell in an inner insertion mode, so that the whole volume of the silencer can be further reduced.
Furthermore, a fixing ring plate extends out of the edge of the pipe orifice in the vertical axial direction, bolt holes are formed in the fixing ring plate, and the fixing ring plate is used for being connected with a fan pipeline. The arrangement facilitates the connection between the silencer and the fan pipeline.
According to the working principle of the silencer of the air conditioner fan pipeline, the fixing ring plate of the silencer is connected with the fan pipeline through the bolts, air flow enters the silencer through the guide inclined plane, when the air flow passes through the shunt tubes, sound absorption is carried out on the sound absorption material filled in the shunt tubes, the air flow contracts and expands when flowing through the inner insert tubes and the air gaps, the resonant cavity is formed, the acoustic reflection effect of the acoustic performance mutation positions in the pipeline is changed, acoustic impedance mismatching is generated, sound waves with certain frequencies are reflected and interfered at the acoustic impedance mutation positions, the silencing and noise reduction effects are improved, and the air flow is not blocked.
Compared with the prior art, the utility model, following beneficial effect has:
the utility model discloses an air conditioner fan pipeline silencer, simple structure, through interior intubate and the air gap that has increased the interpolation, the sound wave that makes some frequencies takes place to reflect, interference etc. at acoustic impedance sudden change department and promotes the effect of making an uproar and falling the noise to through the parameter design of shell, interior intubate and shunt tubes, and the selection of sound absorbing material, make the silencer realize the continuous regulation of the air conditioner fan aerodynamic noise in the great scope.
Drawings
Fig. 1 is the utility model discloses a structural schematic diagram of air conditioner fan pipeline silencer.
Fig. 2 is a front view of the air conditioner fan pipeline silencer of the present invention.
Fig. 3 is a cross-sectional view taken along line a-a of fig. 2.
Fig. 4 is the utility model discloses an air conditioner fan pipeline silencer and fan pipeline's connection schematic diagram.
Fig. 5 is a graph showing a comparison of the transmission loss between the muffler having an air gap of 25mm and the muffler having an air gap of 0 mm.
Fig. 6 shows the transmission loss of the silencer in the range of 10-3000Hz when the air gap of the silencer is 21 mm.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 and 2, the present embodiment provides an air conditioner fan duct silencer including an outer case 1, an inner insertion tube 2, and a shunt tube 3, a sound absorbing material 13, and a partition plate 14.
As shown in figures 1 and 3, the housing comprises a silencing section 4 and pipe orifices 5 arranged at two ends of the silencing section, the cross-sectional area of the silencing section is larger than that of the pipe orifices, the inner inserting pipe is arranged at the silencing section, the distance between the inner inserting pipe and the silencing section is 45-55mm, the cross-sectional area of the inner inserting pipe is the same as that of the pipe orifices, the partition plate is arranged between the inner inserting pipe and the silencing section, an air gap 6 is arranged between the inner inserting pipe and the partition plate, the air gap is 18-30mm, and the thickness of the partition plate is 1 mm.
The shunt tube is positioned in the inner insertion tube, is axially connected with the inner wall of the inner insertion tube and separates the inner insertion tubeThe dividing pipe is internally provided with a silencing cavity 7, the inner inserting pipe and the dividing pipe are respectively provided with a plurality of through holes 8, and the silencing cavity is filled with a sound absorbing material 13, wherein in the embodiment, the sound absorbing material is glass fiber cotton, the density of the sound absorbing material is 100g/L, the porosity of the sound absorbing material is 0.95, and the flow resistance of the sound absorbing material is 10000 Pa.s/m2The acoustic performance of the silencer can be effectively improved by filling the glass fiber cotton, and particularly, the transmission loss is obviously improved in the range of 900Hz to 2000 Hz.
As shown in fig. 1, 3 and 4, the two axial ends of the shunt tube are provided with closed guide slopes 9, which reduce the resistance of the air flow entering the muffler and reduce the noise; the edge of the pipe orifice vertically and axially extends to form a fixed ring plate 10, the fixed ring plate is provided with bolt holes 11, the fixed ring plate is used for being connected with a fan pipeline 12, and the arrangement facilitates the connection between the silencer and the fan pipeline.
As shown in fig. 1 and 3, the inner tube has a perforation rate of 20%, the inner tube has a perforation diameter of 5mm, the dividing tube has a perforation rate of 20%, the dividing tube has a perforation diameter of 5mm, the dividing plate has a perforation rate of 20%, the dividing plate has a perforation diameter of 5mm, and the inner tube, the dividing tube, and the dividing plate are made of galvanized tubes.
According to the working principle of the silencer of the air conditioner fan pipeline, the fixing ring plate of the silencer is connected with the fan pipeline through the bolts, air flow enters the silencer through the guide inclined plane, when the air flow passes through the shunt tubes, sound absorption is carried out on the sound absorption material filled in the shunt tubes, the air flow contracts and expands when flowing through the inner insert tubes and the air gaps, the resonant cavity is formed, the acoustic reflection effect of the acoustic performance mutation positions in the pipeline is changed, acoustic impedance mismatching is generated, sound waves with certain frequencies are reflected and interfered at the acoustic impedance mutation positions, the silencing and noise reduction effects are improved, and the air flow is not blocked.
Example 2
The technical parameters of the silencer applied to a large air conditioner are shown in the following table:
TABLE 1 technical parameters of a large air conditioner
The results of comparing the transmission losses of the front and rear mufflers increasing the air gap by 25mm are shown in fig. 4 by performing FEM-AML modeling and analysis on the preliminarily designed mufflers. As can be seen from FIG. 4, the transmission loss of the silencer with the increased air gap is significantly increased in the range of 0-2350Hz, and the transmission loss is increased from about 113.5dB to 133.1dB and increased by 17.2% in the full frequency range of 0-3000 Hz. Wherein, within the range of 0-350Hz, the transmission loss is improved from 115.8dB to 131.5dB, which is improved by 13.6%; within the range of 350-1000Hz, the transmission loss is improved from 119.2dB to 139.3dB, which is improved by 16.9%; the transmission loss in the range of 1000-2000Hz is improved from 82.1dB to 113.1dB, and is improved by 37.8 percent; within the range of 2000-3000Hz, the transmission loss is improved from 38.0dB to 52.3dB, and is improved by 37.4 percent; the transmission loss in the middle and low frequency range is improved from 118.3dB to 137.8dB, and is improved by 16.5%. The above analysis shows that the silencer with the 25mm air gap is improved in the full frequency range due to the comprehensive utilization of the resistance and resistance silencing principles, the acoustic performance of the silencer is improved by 16.5% in the medium and low frequency range with concentrated fan pipeline noise, and the silencing effect is obvious.
Then, FEM-AML analysis is carried out on the silencer at different air gaps, the distance between the inner inserting pipe and the silencing section is kept to be 50mm, the air gap is increased to 23mm from 18mm, the transmission loss of the silencer at low frequency is continuously reduced, the silencing quantity at medium and high frequency is continuously increased, the noise of the fan pipeline mainly consists of medium and low frequency noise, the average silencing quantity of the silencer at medium and low frequency ranges of 18mm, 19mm, 20mm, 21mm, 22mm and 23mm is respectively 202.9, 203.9, 205.8, 203.9 and 203.9dB through calculation, and the transmission loss of the medium and low frequency noise of the silencer at 21mm is the maximum.
As the silencer is the air conditioner fan pipeline silencer, in order to prevent too much energy consumption when air flow passes through, the resistance coefficients of the silencer are respectively 2.67, 2.77, 2.84, 2.96 and 3.06 when the air gap is 18-22mm according to the analysis of aerodynamic performance, the resistance coefficient of the silencer is continuously increased along with the continuous increase of the air gap, the resistance coefficient at the position of 21mm is 2.96, and the requirement on the aerodynamic performance is met.
From the above analysis, it can be known that, when the distance between the inner insertion tube and the muffling segment is kept to be 50mm and the air gap is 21mm, the maximum value of the muffler transmission loss is about 205.8dB, the pressure loss of the muffler increases with the increase of the air gap, when the air gap is 18mm, the pressure loss is 99.6Pa, and when the air gap is 30mm, the pressure loss increases to 138.6Pa, and considering the acoustic performance and the aerodynamic performance comprehensively, the muffler with the air gap of 21mm has the best acoustic performance, the resistance coefficient is in the allowable range, and the aerodynamic performance is not greatly influenced and is the best choice. It follows that the muffler provides the best sound damping when the air gap is 42% of the distance between the inner insert tube and the sound damping section. The transmission loss of the optimized muffler in the range of 10-3000Hz is shown in fig. 5.
As can be seen from FIG. 5, the transmission loss value in the range of 10Hz-470Hz is continuously increased, the transmission loss reaches the peak value of 123dB at 470Hz, and the transmission loss at 10Hz is only 71 dB; the transmission loss of the silencer begins to rapidly decrease in the range of 470 and 1430Hz, and the transmission loss at 1430Hz is reduced to 56 dB; the transmission loss in the 1430-3000Hz range is generally in a slowly decreasing situation, the transmission loss of the silencer is even only 21dB at 2870Hz, but some peak values of the transmission loss occur, such as 68dB at 1610Hz, 56dB at 1850Hz, 50dB at 2430Hz, and only 38dB and 34dB at 2410Hz and 2450 Hz. The transmission loss at low frequency (20-350Hz) reaches 116dB, the transmission loss in 350Hz-1000Hz is 119dB, the transmission loss in the range of 1000-2000Hz is reduced to 82dB, the transmission loss in the range of middle and low frequency (20-1000Hz) is 118dB, only 38dB remains in the range of 2000-3000Hz, and finally, the transmission loss of the silencer is 109dB in the full frequency range of 0-3000 Hz.
Example 3
This example differs from example 1 in that the inner tube had a perforation rate of 21%, the diameter of the perforations in the inner tube was 4mm, the perforation rate of the shunt tube was 21%, the diameter of the perforations in the shunt tube was 4mm, the perforation rate of the partition plate was 21%, and the diameter of the perforations in the partition plate was 4 mm.
As described above, the present invention can be realized well, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present invention are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. The silencer for the air conditioner fan pipeline is characterized by comprising a shell, an inner inserting pipe, a partition plate and a sound absorption material, wherein the inner inserting pipe is connected inside the shell, the partition plate is arranged between the inner inserting pipe and the shell, an air gap is formed between the inner inserting pipe and the partition plate, the sound absorption material is filled between the shell and the partition plate, and a plurality of through holes are formed in the inner inserting pipe and the partition plate respectively.
2. An air conditioner blower duct silencer according to claim 1, wherein the air gap is 18-30 mm.
3. An air conditioner fan duct silencer according to claim 2, wherein the spacing between the outer casing and the inner insert is 45-55 mm.
4. An air conditioner fan pipeline silencer according to claim 1, further comprising a shunt tube, wherein the shunt tube is located in the inner insertion tube, the shunt tube is axially connected with the inner wall of the inner insertion tube to divide the space in the inner insertion tube, a silencing chamber is arranged in the shunt tube, a plurality of through holes are formed in the shunt tube and communicated with the silencing chamber, and the silencing chamber is filled with sound absorbing materials.
5. An air conditioner fan duct silencer according to claim 4, wherein both axial ends of the flow dividing pipe are provided with closed guide slopes.
6. An air conditioner fan duct silencer according to claim 4, wherein said inner insertion tube has a perforation rate of 15-23%, said bypass tube has a perforation rate of 15-23%, and said partition plate has a perforation rate of 15-23%.
7. An air conditioner fan duct silencer according to claim 4, wherein the diameter of the perforations in said inner insert tube is 4-7mm, the diameter of the perforations in said shunt tube is 4-7mm, and the diameter of the perforations in said divider plate is 4-7 mm.
8. An air-conditioning fan duct silencer according to claim 4, characterized in that the sound-absorbing material is glass fiber wool, the density of which is 95-110g/L, the porosity of which is 0.9-0.98, and the flow resistance of which is 10000Pa s/m2。
9. An air conditioner fan duct silencer according to claim 1, wherein the outer casing includes a silencing section and nozzles at both ends of the silencing section, the silencing section having a cross-sectional area larger than that of the nozzles, the inner insertion pipe being provided at the silencing section, the inner insertion pipe having a cross-sectional area equal to that of the nozzles.
10. An air conditioner fan duct silencer according to claim 9, wherein the edge of the nozzle extends vertically and axially out of a fixing ring plate, the fixing ring plate is provided with bolt holes, and the fixing ring plate is used for being connected with the fan duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922246657.7U CN211781878U (en) | 2019-12-16 | 2019-12-16 | Air conditioner fan pipeline silencer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922246657.7U CN211781878U (en) | 2019-12-16 | 2019-12-16 | Air conditioner fan pipeline silencer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211781878U true CN211781878U (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922246657.7U Active CN211781878U (en) | 2019-12-16 | 2019-12-16 | Air conditioner fan pipeline silencer |
Country Status (1)
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|---|---|
| CN (1) | CN211781878U (en) |
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- 2019-12-16 CN CN201922246657.7U patent/CN211781878U/en active Active
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